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/*
* ImmrHIDUtilAddOn.c
* UseFFAPIFromHIDUtilities
*
* Created by rlacroix on Wed Oct 16 2002.
* Copyright (c) 2002 Immersion Corporation. All rights reserved.
*
*/
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOCFPlugIn.h>
#include <IOKit/hid/IOHIDLib.h>
#include <IOKit/hid/IOHIDUsageTables.h>
#include "HID_Utilities_External.h"
#include "ImmrHIDUtilAddOn.h"
//---------------------------------------------------------------------------------
//
// AllocateHIDObjectFromRecDevice()
//
// returns:
// NULL, or acceptable io_object_t
//
//---------------------------------------------------------------------------------
io_service_t AllocateHIDObjectFromRecDevice( pRecDevice pDevice )
{
CFMutableDictionaryRef matchingDict;
UInt32 locationID = pDevice->locID;
CFNumberRef refUsage = NULL;
mach_port_t masterPort = NULL;
IOReturn result = kIOReturnSuccess;
io_service_t hidDevice = NULL;
do // while( 0 )
{
result = IOMasterPort (bootstrap_port, &masterPort);
if( result != kIOReturnSuccess )
{
break;
}
// Set up the matching criteria for the devices we're interested in.
// We are interested in instances of class IOHIDDevice.
// matchingDict is consumed below (in IOServiceGetMatchingService)
// so we have no leak here.
//
matchingDict = IOServiceMatching(kIOHIDDeviceKey);
if (!matchingDict)
{
break;
}
// Add a key for locationID to our matching dictionary. This works for matching to
// IOHIDDevices, so we will only look for a device attached to that particular port
// on the machine.
//
refUsage = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &locationID);
CFDictionaryAddValue( matchingDict,
CFSTR(kIOHIDLocationIDKey),
refUsage);
CFRelease(refUsage);
// IOServiceGetMatchingService assumes that we already know that there is only one device
// that matches. This way we don't have to do the whole iteration dance to look at each
// device that matches. This is a new API in 10.2
//
hidDevice = IOServiceGetMatchingService( masterPort, matchingDict);
}
while( 0 );
// Free master port if we created one.
//
if (masterPort)
mach_port_deallocate(mach_task_self(), masterPort);
return hidDevice;
}
//---------------------------------------------------------------------------------
//
// FreeHIDObject()
//
//---------------------------------------------------------------------------------
bool FreeHIDObject( io_service_t hidDevice )
{
kern_return_t kr;
kr = IOObjectRelease(hidDevice);
return( kIOReturnSuccess == kr );
}
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